I've often see this statement (or similar) on this forum. And it's often by our more experienced members. Clearly, if you can do it once, you can do it again?....and again?...and again right? Of course you can!
However, I've also noticed that there appears to be a general approach that accompanies such statements. It therefore suggests a potential solution, I dare to suggest.
Most people (perhaps not all) who make this statement appear to be very "laissez faire" in their cooking approach. They appear to "add a chef's spoon of this", a "dollop of that", "a glug of this", "a handful of another", "a ladle of that", etc, etc. They also don't appear to document their approach. I'm guilty too of course.

Now that's all very fine and dandy, if you want to retain some "innovative flare" and want a different result each time. Or if you are a professional chef, doing it day-in, day-out, of course - in which case, who needs to measure things right?
However, as is the case with ANY process, you need to control the inputs (process variables) to reproduce the end result. It's obvious isn't it?. It's commonly called "Quality Control" of course. That certainly means trying to be precise with quantities - by measuring them with a reasonable degree of accuracy.
Unfortunately, this precludes the "laissez faire" approach, for most of us, if we want to achieve anything like reproducible results each time.
My advice is to measure every key variable (quantities, times, temperatures, etc) that can reasonably be measured, to a reasonable and practical degree of accuracy, and to document what you do (the process).
We might then stand half a chance of reproducing that brilliant tasting curry when we finally achieve it!
